This test must be performed quickly (in less than 10 seconds) to prevent coil from burning and ignition power transistor from breaking.

Connect and disconnect 4.5 - 9.0 V battery between terminals No. 2 and No. 3, and check the ohmmeter to see if there is continuity or not.

Fig. Test connections for the primary coil and ignition power transistor continuity check

If results do not agree with the accompanying chart, replace the primary coil and ignition power transistor assembly.

Fig. Primary coil and power transistor continuity chart

Secondary Coil Check

NOTE

It is not possible to check the secondary coil through the continuity check as a diode is integrated in the secondary coil circuit of this ignition coil. As a result, check the secondary coil using the following procedure.

Disconnect the ignition coil connector.

Remove the ignition coil and install a new spark plug to the ignition coil.

Connect the ignition coil connector.

Ground the side electrode of the spark plug and crank the engine.

Check that spark is produced between the electrodes of the spark plug.

If no spark plug is produced, replace the ignition coil with a new one and recheck.

If spark is produced with the new ignition coil, replace the old one as it is faulty. If no spark is produced again, the ignition circuit is suspected as faulty. Check the ignition circuit.